$\pi \pi$ Invariant mass spectrum in $V^{\prime }\to V\pi \pi$ and the $f_0(600)$ pole

A. Gallegos, J. L. Lucio M., J. Pestieau

We consider the phenomenological description of the two pion invariant mass spectrum in the $V^{\prime }\to V\pi \pi$ decays. We study the parametrization of the amplitude involving both $S$ a…